Introduction to the portrait of Liu Xian: Liu Xianren (967 AD - 1085 AD), whose name is Jing and whose courtesy name is Zhongyuan, is the oldest person in Guilin's recorded history. The medical masterpiece "Yangqi Decoction" he left behind is famous in my country. It has high practical value in the research of traditional Chinese medicine and is recorded in "Guangnan Theory of Health Preservation". In 2010, it won the Guinness Book of World Records and became the "oldest medical decoction" in my country and the world.